The latest chapter of "Attack on Titan" offers a subtle but very important update about the past. The chapter also features Eren's realization of his past with another revelation that somehow connects every Titan in existence.
Chapter 89 Recap
Chapter 89 of "Attack on Titan" is already available for online reading through Manga Stream. The latest edition chronicles the relationship of Historia and Ymir with the latter revealing her past. Historia, Eren, Mikasa and the rest of Survey Corps leave to attend the meeting of the council.
The full extent of Eren's memory and information gathered from Grisha's journal was revealed. Because of the information it was decided that the only way to win the war is to harness the power of Founding Titan through Eren. Although Eren has an idea on how to call up the Founding Titan, he hesitated because Historia's life might be in danger.
The chapter ends with a memory of Grisha and Kruger in the walls. Kruger was about to inject Grisha with the Titan serum and gives him final instructions. The chapter ends with a surprise as Kruger casually mentions the name of Armin and Mikasa.
Memory of Past and Future
The Reddit discussion on the latest chapter focuses on the possibility of Eren using the power of Historia to tap the Founding Titan. He has to find a way to get the power of Historia - either through practical means by simply tapping her or through science.
On the other hand, Kruger casually mentioning the name of Armin and Mikasa created a lot of questions about the memories of the Titans. It is possible that each Titan can tap into the memory of the past and even future Titans. Grisha could have taken advantage this memory and Eren could also use this to learn more about the Titans past and future.